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Development Platforms

Development Platforms. 2110472 Computer Networks Natawut Nupairoj, Ph.D. Department of Computer Engineering Chulalongkorn University. Outline. Overview. J2EE Platform. Microsoft .NET Platform. Web Service Platform. Overview. Static vs. dynamic pages. Common Gateway Interface (CGI)

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Development Platforms

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  1. Development Platforms 2110472 Computer Networks Natawut Nupairoj, Ph.D. Department of Computer Engineering Chulalongkorn University

  2. Outline • Overview. • J2EE Platform. • Microsoft .NET Platform. • Web Service Platform.

  3. Overview • Static vs. dynamic pages. • Common Gateway Interface (CGI) • External extension (program) for web server. • Used mostly to connect to database. • Early days • C and perl. • Counter, guest book, graph generator. • Out-of-process model.

  4. Basic CGI Model Web Server Process CGI Program (External) Parameters HTML page • Problem ? • Low performance • Must run a new program every time it is being invoked. • In-process model – include interpreter inside web server • mod_perl. • ASP. • Plug-in model – separate process (but already started). • External AppServer through socket.

  5. Java Platforms • Java-Based Platforms • J2SE (Standard Edition) • JVM / JRE. • Applet and applications. • J2ME (Micro Edition) • For mobile and wireless equipment. • Midlet. • J2EE (Enterprise Edition) • A set of services. • Servlet, JSP, and EJB.

  6. Java Platforms (2)

  7. J2EE Services • Java Server Page (JSP). • Servlet. • Enterprise JavaBean (EJB). • Java Connectivity Architecture (JCA). • Java Message Service (JMS). • Java Management Extension (JMX). • Java Naming and Directory Interface (JNDI).

  8. J2EE Architecture

  9. JSP Example

  10. Servlet Example import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HelloWorldServlet extends HttpServlet { public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { HTML res.setContentType( "text/html" ); ServletOutputStream out = res.getOutputStream(); out.println( "<html>" ); out.println( "<head><title>Hello World</title></head>" ); out.println( "<body>" ); out.println( "<h1>Hello World</h1>" ); out.println( "<p>Congratulations, your servlet is working!</p>" ); out.println( "</body>" ); out.println( "</html>" ); } }

  11. Microsoft .NET • Suite of products • Programming Languages • C#. • ASP.NET. • VB.NET. • Third parties: NetCOBOL, Visual Perl, Visual Python, etc. • Development system. • Servers. • Common Language Runtime • JVM-liked, but supporting multiple languages.

  12. .NET Architecture

  13. Generating Dynamic Pages • Model-View-Control Pattern • Model – data provider • Connect to the database. • View – presentation provider • Generate HTML page from Model. • Control – logic provider • Receive a request and control both View and Model.

  14. MVC Pattern Business Logic & Presentation Database Web Server Biz Logic (Control) Database Logic (Model) Browser Presentation (View)

  15. Benefits of MVC Pattern • Simple to Maintain • Separate business, database, and presentation logic. • Database access is encapsulated in DB logic. • Flexible presentation • Template-like system. • Simple to support more than one languages.

  16. J2EE in Actions

  17. .NET in Actions

  18. J2EE vs. .NET • J2EE • Multi-Platforms: Unix, Windows, and others. • Scalable and high-performance. • Complete server-level services: JMS, EJB, JCA, and others. • .NET • Multi-Languages: C#, VB.Net, ASP.Net, and others. • Good development tools: Visual Studio .NET. • Simple to develop. • Built-in supports for XML and Web services. • CLR will play a very critical role.

  19. References • H. Sheil and M. Monteiro, “Rumble in the jungle: J2EE versus .Net, Part 1”, JavaWorld, June 2002, http://www.javaworld.com/javaworld/jw-06-2002/jw-0628-j2eevsnet_p.html. • J. Lurie and R. Belanger, “The great debate: .NET vs. J2EE”, Javaworld, March 2002, http://www.javaworld.com/javaworld/jw-03-2002/jw-0308-j2eenet_p.html. • jGuru, JavaServer Pages Fundamentals,http://developer.java.sun.com/developer/onlineTraining/JSPIntro/contents.html.

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